DDS Tape problems

Pavel Duda element at
Mon Jun 20 11:15:19 GMT 2005

Greg 'groggy' Lehey wrote:
> On Sunday, 19 June 2005 at 21:22:43 +0200, Pavel Duda wrote:
>>I have problem with my DDS-3 type drive. I'm able to write on it but not
>>read data back. If I try to read them I get card dump and tape drive
>>hangs up. I have tried to upgrade firmware but problem remains. Does
>>somebody have experience with this ?
>>My specs :
>>FreeBSD 5.2.1, generic kernel, x86 (P3), SCSI card is Adaptec AHA2940
>>and tape drive Python 04106.
>>I'm attaching dmesg output.
> I don't have time to investigate the status output in detail, but at
> first glance the output looks consistent with hardware failure.  I've
> had this so many times with tape drives, in particular DDS, that I
> have given up using them altogether: not a single one survived its
> guarantee period.  If it's not the drive, it could be the tape, though
> I've seen far fewer problems in this area.  Does this drive (and tape)
> work in other systems?

Yes. I was recently using it in my AIX Netfinity machine. Some tapes 
used for test are new. I will test to record something and read it in 
machine in work.

> I don't think it's termination; you say you only see the errors during
> reading, and that doesn't fit.

Termination is OK and there is only tape drive at this time (all 
unnecessary drives were removed to minimize possible interferences).

> What does the drive do when you try to read it?  A lot of
> back-and-forth is usually an indication of hardware read errors.

Both LEDs are on and tape drive doesn't react to eject button.

> Greg
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